The Man with the Golden Gun by Ian Fleming

Returning to service after his explosive battle with Ernst Blofeld, British secret agent James Bond must prove himself worthy of his 00 designation. On the trail of notorious assassin "Pistols" Scaramanga, a.k.a. The Man with the Golden Gun, Bond infiltrates Scaramanga's network, only to discover that Bond himself is a target.
The Man with the Golden Gun is the thirteenth title in the James Bond spy series. It was adapted for a 1974 film starring Roger Moore as James Bond.